Lenovo ThinkSystem Rear Door Heat eXchanger V2 User Manual page 30

Figure 25. Typical extended manifold (along aisles between racks)
Flexible hoses and connections to manifolds and heat exchangers
Pipe and hose configurations can vary. You can determine the best configuration for your installation by
analyzing the needs of your facilities, or a site preparation representative can provide this analysis.
Flexible hoses are needed to supply and return water between your hard plumbing (manifolds and coolant
distribution units) and the heat exchanger (allowing needed movement for opening and closing the rack rear
door).
Hoses are available that provide water with acceptable pressure-drop characteristics and that help prevent
depletion of some corrosion inhibitors. These hoses must be made of peroxide-cured ethylene propylene
diene monomer (EPDM) rubber, non-metal oxide material and must have Parker Fluid Connectors quick-
connect couplings at one end which are attached to the heat exchanger, and must either have a low
impedance quick connect coupling or nothing so as to attach to a barb at the other end. The Parker
couplings are described in this topic and are compatible with the heat exchanger couplings. Hose lengths
from 3 to 15 meters (10 to 50 ft), in increments of 3 meters (10 ft), are available. Hoses that are longer than 15
meters (50 ft) might create unacceptable pressure loss in the secondary circuit and reduce the water flow,
reducing the heat removal capabilities of the heat exchanger.
Use quick-connect couplings to attach the hoses to the heat exchangers. Hose couplings that connect to the
heat exchanger must have the following characteristics:
• The couplings must be constructed of passivated 300-L series stainless steel or brass with less than 30%
zinc content. The coupling size is 19 mm (0.75 in.).
• The supply hose must have a Parker (male) quick-coupling nipple, part number SH6-63-W, or equivalent.
The return hose must have a Parker (female) quick-connect coupling, part number SH6-62-W, or
equivalent.
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ThinkSystem Rear Door Heat eXchanger V2 User Guide